6 tbsp. water
6 tbsp. salt
6 tbsp. liquid bluing
2 tbsp. liquid ammonia
2 tbsp. food coloring

Place a piece of coal in a deep glass dish. Mix water, salt, liquid bluing and liquid ammonia. Pour the liquid around the coal (not on it). Dot the coal with 2 tablespoons food coloring. Do not move the dish. The coral like crystals will soon appear and spread over the coal. They will grow to height of about 2" in a sponge like appearance and will last for weeks. Be sure to keep out of reach of children.